Nikolic's pre-selection as the Liberal Party candidate for the 2013 federal election for the seat of
Bass in Tasmania - which had been held by the Labor Party since 2007 - was announced on 8 July 2011. He had expressed interest in contesting the seat of Bass after the leadup to the 2010 election when he was stationed in Canberra. Although an election was not required until 30 November 2013, Nikolic began campaigning actively soon after pre-selection. He set up a website for his candidacy, and his campaigning activities in the Launceston area were reported in the media, along with his confrontations with local environmentalists. Following a satirical posting about him on Facebook in May 2012, it was reported that Nikolic had threatened to contact the employers of readers who "liked" the post. Nikolic denied making these threats, and later stated that he had no intention of contacting any employer; that his request was just for the posting to be removed. The story was published by international media. In July 2013, the story was subsequently the subject of a ruling by the
Australian Press Council. In July 2013, in response to a complaint filed by Nikolic, the Australian Press Council found that
The Sydney Morning Herald "failed to take reasonable steps to ensure accuracy and fairness" on some matters in its article on the subject. In mid-August 2013, the then sitting member for Bass,
Geoff Lyons, made false statements to high-school students about Nikolic's military career, claiming Nikolic had "misled" journalists about his role in the military. Lyons subsequently said he was "sincerely sorry" for his remarks about his opponent. Nikolic was elected in September 2013 with a swing of almost 11 percent. On 13 February 2015, Nikolic was appointed Government Whip by Prime Minister
Tony Abbott, following the dismissal of
Philip Ruddock as Chief Government Whip. Nikolic was dropped as Government Whip on 20 September 2015 as a result of a ministerial reshuffle by the new prime minister,
Malcolm Turnbull, who had been elected during a
leadership spill earlier that month. On 2 July 2016, Nikolic lost his seat to
Ross Hart of the Australian Labor Party, after a 10.1% swing against him in the two party preferred vote. ==Family==